Top cap



FIG. 1 is a perspective view of a top cap of the present invention;

FIG. 2 is a first side view of a top cap of the present invention;

FIG. 3 is an opposite side view of a top cap of the present invention;and,

FIG. 4 is a front plan view of a top cap of the present invention.

I claim the ornamental design for a top cap, as shown and described.